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Q: What is the difference between these and Item #: XFS14104AWFL-126 (14 x 10 x 4

A: The box shown above is called a 'locked corner' box which means this 1 piece design, corners will need to be notched on all four sides (see our video link at the bottom of the page to see how these boxes are installed). This material is thinner than the premium, semi automatic box that you inquired about, therefore it is heavier.